Type-writing machine.



L. C. MYERS.

TYPE WRITING MACHINE.

APPLICATION IILEDAUG. 1a, 1909.

938,500. Patented Now-2, 1909.

WITNESSESL. Y i K INV r09 MTORNEY UNITED sTArEs PATENT or fice.

LEWIS C. MYERS, OF NEW YORK, N. Y.. A SSIGNOR- TO ROYAL TYPEWRITER COMPANY,

,OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

ryrn-wni'rmo MACHINE.

Specification of Letters Patent.

Application filed August 18,1909. Serial No. 513,396.-'

Im )rovement in T e-VVritin Machines of l yp a which the following is a specification.

This invention relates to a simple means for n'nposing friction upon the platen to prevent .the latter turning when the feed 'devices are thrown off.

In the'accompanying drawing: Figure l 1s a detail front elevation showing one end o fthe platen and its shaft. Fig. 2, a section on the line 2, 2 of Fig. 1, showing .the friction device inactive; Fig. 3., a like sec.

tionwith the friction devices in position to resist rotation of the platen; Fig. 4, a View of the friction spring detached; and Fig. 5, a detached view of a lever arm that operates upon the friction spring.-

. 1 is the platen; 2 is the hub; 3 its shaft turning in the side 'plate 4 of the carriage;

5 the knob or twirler and G its hub applied to the end of the platen shaft.

Loosely mounted 'on the platen shaft outside of the side plate 4 is a concavo-convex spring-plate 7 whose edge may have any desired contour. This plate 7 shouldnot turn with the platen shaft and to render unnecessary attachment thereof to the side plate of the carriage, it is formed with extensions 4 1-, having respectivelyturned over lips 8, 9, that respectively embrace the top and rear edges of the side plate. The convex surface of this spring plateis turned outwardly,that is, it is contiguous to the inner edge of the twirler hub 6, and loosely mounted on the platen shaft 3 between the inner face of the hub 6 and the outer or convex face of the spring-plate is a lever arm 10 having a flat circular hub 10 and an extension formed with a thumb piece. Across the hub 10 is a rib 10 preferably radially disposed preferably formed by corr-ugating the sheet metal of which the; lever arm 10 is composed. In a line passing through the axis of the platen transversely to a linev passing through the extension 7 7 the spring-plate 7 has two opposite projections 7 7. The plate is so shaped that the opposite parts includingthe portions 7, 7 are comparatively flat and the opposite parts including the projections 7 7 are i crowned or concavo-convex and consequently when the lever arm 10 is thrown into the position shown in Fig. 3, the rib I0 riding upon the'surfaceof the spring-plate, flat-c tens it more or less and its reaction holds the hub 10 of the lever arm in suflicient frictional contact with the end of the-twirler hub 6 to prevent accidental or unintentional rotation of the platen by manipulation of the paper while the feed devices are re. leased. When in the position shown in Fig. 2, the lever arm imposes no compression strain on the spring-plate and no frictional resistance is opposed to the rotation of the platen.

vIclaim: i

1. In a typewriting machine, a-rotatable platen, a carriage end plate in "which the Patented NOV. 2, 1909.

platen-shaftrotate's, a twirler knob having a hub applied to the end of, the platen shaft outsideof the sideplate,'a concavo-convex spring-plate loosely mounted upon the platen shaftoutside of the side plate and a lever arm interposed between the convex surface of the spring-plate and the inner end of the twirler hub/and formed with means for com-' pressing the spring-plate when swungin one direction, for the purpose set forth.

vex spring-plate loosely mounted upon the 2 The combination with a rotatable platen shaft between the inner end of the twirler hub and the .convex face ofv the spring-plate and having a rib upon' that face of the lever arm contiguous to the surface of the spring-plate, whereby when the lever arm is operated compression of the spring is produced for the purpose set forth.

3. The combination of a rotatable laten,

its shaft, a carriage end plate in which the shaft is mounted to turn, a twirler knob having a hub applied to the outer end of the shaft and friction. devices interposed between the inner end of .the hub and the outer face of the side plate for at will imposing a friction, tending to prevent rotation of the platen. i 1

4; The combination of a rotatable platen,

its-shaft, a carriage end plate in which the shaft is mounted'to rotate, a concavo convex spring-plate loosely mounted on the shaft,

having lips engaging edges of the sideplate 'to prevent rotat on of the spring-plate, a

twirler' having a hub applied to the outer 'In testimony whereof, I have hereunto end of the shaft, a lever arm loosely turning subscribed my name. on the shaft between the hub of the .twirler :LEWIS (1 MYERS and-tl'le outer' face, of the spring-plate and.

' 5 having a rib formed by corrugating the Witnesses:

metal of which the lever arm is made, for E. J. HESS, the purpoge-set forth. A. J. SHERIDAN. 

